uint8                       sign_id
float32                     sign_confidence
geometry_msgs/Vector3       position
float32                     sign_value
SLIFSignType                sign_type
SLIFSignRelevancy           sign_relevancy

# Specify the vehicle type(s) that the sign shall apply to.
# vehicle_categories value : M1 = 0b01, M2 = 0b10, M3 = 0b100, N1 = 0b1000, N2 = 0b10000, N3 = 0b100000
uint8                       vehicle_categories 
